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History of the manufacturer  

advance schools, Inc.; (where?)

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Name: advance schools, Inc.; (where?)    (USA)  
Abbreviation: advancesch
Products: Model types

advance schools, Inc.; (where?)

one VTVM and one Signal Generator known; maybe it was a technician's school ?


This manufacturer was suggested by Gottfried Silberhorn.

Some models:
Country Year Name 1st Tube Notes
USA  65 VTVM - Vacuum Tube Voltmeter 1MB-18-2 6AL5  VTVM with 7 ranges, made by Heath, similar to IM-11